Smoke-preventer.



Patented Apr. 8, |902.

J. H. HOBART.

SMOKE PREVENTER.

(Application led .Tilly 9, 1901.)

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UNirED STATES PATENT OFFICE.

JOHN II. HOBART, OF DENVER, COLORADO.

SMOKE-PREVENTER.

SPECIFICATION forming part of Letters Patent No. 697,085, dated April 8, 1902. Application filed July 9,1901. Seria] No. 67,581. (No model.)

To all whom, it may concern,.-

Beit known that l, JOHN H. HOBART, a citizen of the United States, residing at Denver, county of Arapahoe, State of Colorado, have invented an Improvement in Smoke-Preventers; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to an apparatus which is especially designed for the prevention or consumption of smoke which may be introduced by the combustion of fuel in the furnace and to prevent the smoke from escaping into the open air.

It consists of a furnace having a bridge-wall at the rear and beneath the boiler, with double arches forming an intermediate passage for the products of combustion and means for supplying air to produce a draft transversely to the movement of the products of combustion through said passage, a second wall having pigeonhole-openings therethrough located in the rear of the bridge-wall, with means for supplying air into passages above the openings, and openings by which the air is de1ivered downwardly into each ot' said pigeonholes and transversely to the line of move-- ment of the products of combustion.

My invention also comprises details of construction, which will be more fully explained by reference to the accompanying drawings, in which- Figure l is a longitudinal sectional elevation on the line ro 'w of Fig. 2. Fig. 2 is a transverse section on the line of Figs. l and 3. Fig. 3 is a horizontal section on the line y y of Figs. l and 2.

My invention is especially designed to prevent the formation of or to consume smoke and carbonaceous products of combustion which arise within a boiler or other furnace and to prevent such products escaping into the open air in a visible or deleterious form.

My present invention is shown as. applied to a boiler set in briclzwork and of the form known as stationary boiler; but it may be used in conjunction with other descriptions of boilers or furnaces without materially altering the character of my invention.

As here shown, A is a boiler set in brickwork, as shown at B.

2 is the furnace or fuel-space, and 3 the` grate-bars of the furnace.

At the rear of the furnace is the bridge-Wall 4, and above this wall is an arch 5, forming with the bridge-wall a space 6, through Which the products of combustion passinto the space beneath the central portion of the boiler. Vithin the arch 5 is a chamber or chambers, as at 7, and S represents downwardly-extending openings connecting said chamber with the space 6 and transversely to the line of travel through 6.

9 represents one or more pipes or passages opening at any convenient point for the ingress of air. p these passages openin g through the brick- Work B at what would be the rear of a boiler In the present case I have shown of this construction, and, passing through the rear combustion-chamber of the furnace, the air would commence to be heated, the heat continually increasing as it goes on up tothe point when it enters the chamber?, where it ing fresh oxygen to mingle with the nncon- A sumed products of combustion'at this point the combustion will be carried on by the fresh access of oxygen.

At the rear and at some point between the bridge-Wall and the rear combustion-chamber of the boiler or its furnace is located a second wall lO. This wall extends entirely across between the side walls of the space beneath the boiler, the upper part fitting closely against the boiler, and the Wall extends down approximately to the bottom of the space beneath the boiler. Through this Wall is made a series of pigeonhole-openings, so called, as shown at 11. These openings are arranged in a series of arches, as here shown, and between each of these series of arches are chambers 12, into which air is conducted from an inlet pipe or pipes 13. These pipes or passages extend from the rear of the structurein the same manner as the pipes shown'at 9 and are carried up so as to deliver the air into the intermediate chambers 12, Where it is sufciently heated, and from these chambers the air maybe delivered downwardly through IOO suitable passagesas 14, into the pigeonholefines 11, there heating the products of combustion and transversely to their line of travel. This fresh accession of heated air continues the combustion and finally consumes any unconsumed portion of carbon or other product which reaches this point, so that the gases escaping through the pigeonholes will pass through beneath the boiler, returning thence through the usual returnflues to the smoke-stack or uptake 15, and gases escaping from this stack will show little or no discoloration or deleterious matter.

The main air-supply pipes 9 and 13 may be provided with controlling gates or dampers, as at 16. The pipes extend along each side and interior to the side walls of the comhus tion-chamber, where they will be exposed to i the heat without obstructing the passage of the products of combustion, and they are y turned upward just behind the walls 4 and 10 and have branches opening into each of the heating-chambers of their respective arches.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is

l. The combination with a boiler, the rebox thereof and a bridge-wall at the rear of the fire-box, of an arch fitted above the bridgewall having an internal chamber, connections made between said chamber and the heatpassage below the'arch, means for supplying air into the chamber Within the arch, a second arch located at the rear of the bridgewall having pigeonhole therethrough, and a heating-chamber formed above said passages, with connections from the chambers into the passages,.and meansffor supplying air into said chamber.

' 2. The combination in a boiler, the fire-box bridge-wall and rear combustion-chamber thereof, of a plurality of arches located beneath the boiler, one in rear of the other, a

)arch and means for supplying air thereto,

passages leading downwardly from said chamber, discharging air to mingle with the products of combustion in the space beneath the arch, a plurality of openings through the rearmost arch with corresponding heating-chambers above each series, air-supply passages connecting with said heating-chambers and passages delivering air from the chambers into the heat-passages below.

3. A boiler-furnace including a plurality of bridge-walls located at different distances from the fire-box, an arch above each of said walls and forming between itself andthe wall a passage for products of combustion, heatin g-chambers formed in the upper portions of the arches and passages leading from said chambers and discharging air to mingle with the products of combustion, and separate airinlet passages connecting through openings in the rear walls of the arches.

4. A boiler-furnace including a grate, a rear combustion-chamber, a plurality of walls between said grate and chamber, an arch above each wall and forming between itself and the Walla passage for the products of combustion, one of said walls having contracted openings through it, heating-chambers in the upper portions of the arches and passages leading from the chambers and discharging air into the Smoke-passages to mingle with the products of combustion, and air-pipes having ends upturned and located back of each wall and communicating with the heating-chambers therein.

5. A boiler-furnace having a grate, and a rear combustion-chamber, transverse walls between the grate and the rear end, arches above the walls and separated therefrom to form a passage for products of combustion, air-chambers within the arches and branches communicating with the passages therethrough, pipes extending along the inner side walls of the rear chamber, and upturned at the rear of the transverse walls, said pipes having connections with each of the air-chambers.

In Witness whereof I have hereunto set my hand.

JOHN Il. HOBART.

Witnesses.

JESSE P. JAMES, FRANK E. ROBINSON. 

